Trimming machine



Dec. 11 1928.

B. JORGENSEN TRIMMING MACHINE Filed Jan. 29, 1924 Patented Dec. ll,

pair

rarer;

r an "F BERNHARDT JORGENSEN, OF BEVERLY, Mi'tSSACHUSETTS,ELSSIGNOB T0 UNITED SZE-IQE MACHINERY CORPORATIGH; 0E PAT ERSON, NEW JERSEY, CQREORATION- OF Iii JERSEY. I

'rnrmviine MACHINE.

Application filed January 29, 1924; Serial No.. 689,371.

This invention relates to trimming machines and 1s illustrated as embodied in a.

machine designed to trim surplus material a rubber outsole, and

the latter is secured to the bottom of the lasted shoe by vulcanization without any stitching or other fastening means except that an adhesive is used to hold it prior to and during the vulcanizing operation. In eidentally to lasting a shoe of this type the over-drawn marginal portion of the upper is temporarily fastened to the insole by adhesion and although care is exercised to keep said marginal portion as smooth as pt...SllJl8 it. is impossible to avoid forming pleats or crimps Where the upper is lasted around the toe.

3r sa isfactory bond between the outsole and the upper cannot be obtained by vulcanization Unless the bottom of the lasted shoe is smooth and even,'and it is therefore necessary to trim the crimped or pleated portions flush with the smooth bottom sur-' face of the shoe before the outsole is laid.-

Heretofore it has been the practice to per form this trimming operation elther by hand or with a buffing machine, but hand work is too slow to be economical,- while a.

buihng operation is both too slow and productive of unsatisfactory results.

In view of the foregoing considerations an object of this invention is to provide an improved machine for trimming surplus material from the bottom of a lasted shoe, and more especially one adapted to trim off the pleats or crimped portions of a canvas upper to put the shoe in satisfactory condition for a rubber outsole to be vulcanized thereto.

A feature of the invention consists in an improved organization comprising two spaced abutments for guiding the shoe by running in tandem relationon 1ts perimeter as it is fed, and a trimming knife arranged to operate between the points ofcontact afforded by said abutments to trim off the pleats or crim-ped portions of the upper that would otherwise remain at the toe end and militate against a satisfactory union be tween th rubber outsole and the upp r.

These abutments are preferably concaved to extend over the edge formed by the perimeter and bottom of the shoe to p reventthe shoe from approaching too closely to the trimming knife andto counteract the opera tives tendency to rock the shoe from sidetoside. Furthermore; to facilitate the ma nipulation and feeding motion of the shoe two spaced rolls are preferably arranged'to provide the aforesaid abutments, and the aboveanentioned concaved surfaces are formed on their peripheries.

Another feature consists in a novel com.- bination comprising a-trimming knife'and'a guard arranged to control the closeness of trimming, the guard being stationary and arranged to engage the bottom of the shoe.

wl ile the trimn'iing knife is arranged't'o project beyond the guard sufiiciently to trim" off the pleats Without cutting" into the actual bottom of the shoe. This guard and. the trimming knife are relatively adjustable to regulate the closenessof trimming Still another feature consists in" an abutment' arranged to be engaged by'the bottom ofthe shoe in the event of faulty manipula tion of the latter toseparate the shoe from the trimming knife rather than to permit the knife to out too deeply into the oven drawn marginal portion of the upper. This abutment is preferably arranged to clear the Work so long as the latter is manipulated correctly and is therefore no hindrance to manipulation while the latter progresses correctly.

It is well-known that to cut woven material; satisfactorily with a single cutting edge requires not only a very keen cutting edge but also a motion such asto execute. a drawing out. In this respect an. object of the invention is to provide an improved organization in which a single cutting blade Will execute a drawing out and in which its cutting motion may be utilized in conjunction with grinding means to sharpen it to an exceedingly keen edge. In this respect a feature of the invention consists in anorganization comprising a reciprocatory' knife of which the edge extends lengthwise of the lines of reciprocation, and a rotary abrading member arranged to grind the knife transversely of its edge while the reciprocatory operating mot-ion of the knife continues:

clamped thereto by a bolt 30,

rinci al 0 eratin aarts and includin the toe end of a lasted shoe, one side of which has been trimmed and the other side of which is still to be trimmed; and

Fig. 3 is a diagrammatic view showing, in front elevation, the relative positions of the trimming knife, its guard, the crosssectional outline of a lasted shoe, two members for guiding the shoe by its perimeter, and a roll for engaging the bottom of the shoe to prevent the trimming knife from damaging the shoe in the event of faulty manipulation.

Referring first to Fig. 2, the shoe there illustrated has been lasted and comprises an insole 10 and a canvas upper 12. The marginal portion 14 of the upper has been drawn over the edge of the insole and secured to the insole by an adhesive, an incidental to lasting the toe end of this marginal portion has necessarily acquired pleats 16 which, if permitted to remain, would militate against attaching a rubber outsole by vulcanization. It is therefore customary to trim off the pleated portions 16 so that the bottom of the shoe will have a smooth even bottom before the outsole is laid.- The notches 18 in the marginal portion 14 extending along the left-hand side of the shoe are the result of trimming off pleats such as those indicated at 16.

The illustrated machine, which is designed to trim off the pleats 16 flush with the surface of the portion 14 and to guard against trimming off or otherwise cutting any other parts of the shoe, comprises a flat trimming knife 20 having a straight cutting edge 22. This knife is operated to execute a drawing out and is carried by a holder 24 which isreciprocated to move the knife in the direction indicated by arrows in Fig. 2. The shank portion of the knife has a clovetailed cross-section (See Fig. 3) and is adjustably clamped in a correspondingly shaped portion of the holder 24. A screw 26 serves to produce the clamping action of the holder to hold the knife rigidly.

The holder 24 is seated upon the forward end of a reciprocatory carriage 28 and is A notch or slot 32 formed in the holder 24 to receive the bolt provides for adjusting the knife transversely of its lines of reciprocation to adjust the cutting edge to the desired position and to compensate for wear as the edge is ground back incidentally to sharpening the knife.

The carriage 28 is arranged to slide to the front and rear in a bearing afforded by the frame 34, and is operated by an eccentric 36 on a shaft 38. This shaft is journaled in bearings in the frame 34 and may be driven by any suitable means (not shown) in the direction indicated by an arrow'in Fig. 1. An eccentric strap 40 furnishes operating connection between the eccentric and the carriage 28 and is pivotally connected to the latter by a pin 42.

To perform the trimming operation under consideration the operative manipulates the shoe, bottom up, by presenting the shoe to the under side of the trimming knife and turning it so that the margin to be trimmed will move from right to left. his desirable to guide the work and to control the closeness of trimming so that the operative may manipulate the shoe rapidly without danger of cutting off more than the pleated portions 16. For this reason the invention provides improved means for guiding the shoe by engagement with its perimeter and improved means for controlling the closeness of trimming by engagement with the bottom of the shoe. The guiding means, as shown, comprises three stationary abutments arranged in triangular relation, that is, they mark the corners of a triangular area in. which the trimming knife operates. Two of these abutments are anti-friction rolls 44, 46 and the third is a knife guard 66 hereinafter described. The rolls 44 and 46 are arranged in tandem. relation to engage the perimeter of the shoe, one in front of and the other behind the cutting edge of the knife, and they are preferably formed with concave profiles which overhang and engage the edge of the shoe bottom to counteract rocking the shoe from side to side. A. bracket '48 supports the roll 44 and clamped to the frame by a bolt 50, while a slot 52 affords adjustment to the front and rear.

A bracket 54 supports the roll 46 and is supported by a bracket 56. A bolt 58 extends through a slot 60 to clamp the bracket 54, while a bolt 62 extends through a. slot 64 to clamp the bracket 56 to the frame, each slot providing for vertical adjustment of the roll 46.

The illustrated machine includes a shield or guard 66 for controlling the closeness of trimming. As shown, this guard is a thin plate and is fixed to the bottom surface of the bracket 54 and projects from the latter under the trimming knife nearly but not quite to the cutting edge When a shoe is in position for trimming, the guard 66 lies lit) between the bottom of the shoe and the trimming knife and is arranged to be engaged by that portion of the work that has passed the trimming locality; The closeness of trimming may be regulated in either of two ways or by a. combination of both; for example, by vertical adjustment of the guard 66, as provided by the clamping bolt 58 and slot 60, or by the clamping bolt 62 and slot- 64, or by adjusting the trimming knife transversely of its lines of reciprocation as provided for by the clamping bolt 30 and the notch or slot 32. I prefer to adjust the guard 66 so that its outer edge will touch the under surface of the trimming knife as shown by Fig. 3 and to regulate the closeness of trimming by adjusting the knife transversely of its lines of reciprocation so that its cutting edge will project more or less beyond the guard, as required.

The trimming-knife projects in front of the guide rolls 44, 46 to an extent sufficient to maintain it in lapped relation to the exposed area of the insole throughout its range of reciprocation, thus insuring a length of cutting edge 22 more than coextensive with the pleats 16 under all conditions. The trimming knife is reciprocated at a high rate of speed to insure an effective drawing out regardless of how rapidly the shoe is moved past the trimming locality.

Although the guard 66 is effective, for the most part, to prevent the knife from cutting too deeply into the marginal portion 14 of the upper, the invention provides an addi tional safeguard. against too deep cutting when, for example, the shoe is rocked incidentally to faulty manipulation. This safeguard is provided by av roll 68 supported by the bracket 56 in a position overhanging the exposed area of the insole. The roll 68 is set to clear the insole when the shoe is maintained in the proper relation to the various instrumentalities, the extent of clearance being shown by Figs. 1 and 3. This roll is so located that whenever the shoe is rocked thereon it becomes a fulcrum and its effect is to separate the work from the trimming knife. It is therefore possible to trim a shoe only when the latter is held in positions that will insure satisfactory trimming. The clamping bolt 58 and slot 60 provide for adjusting the knife guard 66 to the desired level relatively to the bottom of the guard 1 roll 68.

Since the cutting edge of the knife 20 extends transversely of a straight line passing through the work-engaging points of the two tandem rolls 44 and 46, the shoe may be manipulated to place the surface of the mar; ginal portion 14 parallel and flush relatively to the cutting edge by rocking it toward the front or rear while it bears against said rolls. Rocking the shoe in this manner is desirable to counteract the slope of the marginal portion- 14 along the sides of the shoe, dueto the transverse convexity of the shoe bottom (see Fig. 3). V

The illustrated machine also provides 'convenient means for sharpening the knife with out appreciable loss of time and without detaching the knife from its holder 24. In fact, the sharpening means may be used most advantageously without even stopping the operating motion of the knife as produced by the reciprocatory carriage 28. v

The sharpening means comprises a grinding roll 70 carried by a rotary shaft 72. The shaft is journaled in a bracket 74 and is rovided with a pulley 76 to be driven by a elt 78. The bracket 74 is fastened to and carried by an arm 80 mounted on the shaft 38 so that it may swing about the shaft to carry the grinding roll to and from the trimming knife. The grinding roll is normally retracted from the knife by a compression spring 82 and intended to be movedtoward the knife by manually depressing a knob 84. This knob isattached to a member 86 which is connected to the arm 80 and bracket 74 by a pivot member 88, and is formed with aslot 90 to receive a guide pin or screw- 92 fastened to the frame.

The belt 78 is driven by apulley 94 loosely mounted on the shaft 38, and passes over idle pulleys 96 carried by the bracket 74. The driving pulley 94 is interposed between two frictional clutch disks 98 and 100, both of which are connected to the shaft to be ro tated positively. The disk 98 is fixedto the shaft so that it is held against axial movement, but the disk 100 has splined or equivalent connection with the shaft so that it may have a slight range of axial movement relatively to the shaft. A hub 102 formed on the disk 100 is provided with a peripheral groove for the reception of a shipper 104 by which the disk 100 may be moved toward the disk 98 to clamp the driving pulley 94. Rings of friction material may be interposed between the confronting faces of the driving pulley and the two clutch disks. The shipper 104 is fixed to a rock-shaft 106 and the latter is journaled in a bearing afforded by the frame 34 and is provided with a handle 108 by which it may be rocked to clutch and declutch the pulley 94. I

.W'hen it becomes necessary to sharpen the trimming knife the operative has merely to beardown on the clutch controller 108 and on the knob 84, the controller 108 effecting driving connection of the grinding roll while depressing the knob shifts the grinding roll into engagement with the knife. These motions do not interrupt the operative motion of the knife but merely present the grinding roll to the later while the knife continues to move back and forth lengthwise of its cutting edge as when trimming. The range of grinding is equal to the length of the grinding roll plus. the length of motion imparted to the knife. The reciprocatory motion of the knife thus not only extends the range of grinding action beyond the actual limits of the grinding roll, but distributes the grinding action over the knife in a way that equalizes the grinding action and preserves a substantially straight cutting edge. Moreover, since the knife moves-transversely to the direction of the periphery of the grinding roll the two components of motion produce an oblique grinding action the obliquity of which is shifted alternately to two opposite pitches. This reversing of the direction of the knife while the grinding roll is rotating in contact therewith produces a cutting edge of extreme keenness. A light touch of the grinding roll for one or two seconds at frequent intervals is sufiicient to maintain a keen edge on the trimming knife. edge of the knife is worn back by successive sharpening operations, it desirable to adjust the knife transversely of its edge to maintain the desired degree of projection beyond the guard 66. This adjustment is afforded by the clamping bolt 30 and the slot 32.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A machine of the character described comprising a knife havin a straight cutting edge for trimming surplus material from the bottom of a lasted shoe, mechanism for reciprocating said knife lengthwise of its cutting edge, and means for guiding the shoe relatively to said knife.

2. A machine of .the character described comprising a knife having a cutting edge for trimming surplus material from the bottom of a lasted shoe, mechanism for imparting rectilinear reciprocatory motion to said knife to produce a drawing cut, and means for guiding the shoe, said knife being arranged and operated to remain in lapped relation to the shoe bottom throughout-its range of reciprocat-ion.

3. A machine of the character described comprising a trimming knife and mechanism for operating it to trim surplus material from the bottom of a lasted shoe, and means for guiding the shoe so that it may befed to trim progressively, said means including two spaced abutments arranged to engage the perimeter of the shoe, one in advance of, and the other at the rear of, the cutting edge of said knife.

4. A machine of the character described comprising a knife having a straight cutting edge for trimming surplus material from the bottom of a lasted shoe, mechanism for reciprocating said knife to produce a drawing cut. and two spaced abutments arranged to guide the shoe by engagement with its perimeter, said cutting edge being arranged V In time, as the,

to operate between the points engaged by said abutments.

5. A machine of the character described comprising means for trimming surplus material from the bottom of a lasted shoe, and two spaced rolls arranged to run in tandem relation on the perimeter of the shoe to guide the latter, said trimming means being arranged to operate between the points of contact with said rolls.

6. A machine of the character described comprising two spaced guide rolls arranged to run in tandem relation onthe perimeter of a lasted shoe to guide the latter, a cutter arranged to trim surplus material from the bottom of the shoe between the'points of contact with said uide rolls mechanism for o crating said cutter, and means arranged to engage the bottom of the shoe to control the closeness of trimming.

7. A machine the character described comprising means for trimming surplus material from the bottom of a lasted shoe, means arranged to guidethe shoe, and an abutment arranged to function as a fulcrum to separate the work from said trimming means in the event of faulty manipulation but to clear the shoe so long as the manipulation thereof is correct.

8. A machine of the character described comprising two spaced abutments arranged to be engaged by theperimeter of alasted shoe to guide the latter, a cutter arranged to trim surplus material from the bottom of the shoe between the points of contact with said abutments, mechanism for operating said cutter, a guard arranged behind the cutting edge of said cutter to control the closeness of trimming by engaging the bottom of the shoe, and an abutment arranged to clear the shoe when the latter is correctly presented to said cutter but to engage the bottom of the shoe and thereby effect separation of the shoe from the cutter in consequence of rocking the shoe to an angle-that would otherwise cause the cutter to out too deeply. v

9. A machine of the character described comprising three stationary abutments arranged in triangular relation, and trimming means arranged to trim surplus material from the bottom of a lasted shoe in the triangular area of which said abutments mark the corners, two of said abutments being arranged to be engaged by the perimeter of the shoe to guide the latter and one of them being arranged to be engaged by the bottom to prevent too close trimming.

10. A machine of the character described comprising a flat trimming knife having a cutting edge for trimming surplus material from the bottom of a lasted shoe, means for moving said knife lengthwise of its cutting edge, means for engaging the perimeter of the shoe to guide it relatively to said knife, and means arranged to engage the bottom of the shoe to control the closeness of trimming.

11. In a machine having means for trimming surplus material from the bottom of a lasted shoe, work-guiding means comprising two rolls having concave profiles arranged to run in tandem relation on the edge ffirmed by the bottom and perimeter of the s oe.

12. A machine of the character described comprising trimming means constructed and arranged to trim surplus material from the bottom of a lasted shoe, means arranged to engage the bottom of the shoe to control the closeness of trimm ng, and two stationary rolls having concave profiles arranged to run in tandem relation on the edge formed by the bottom and periphery of the shoe to guide the latter.

13. A machine of the character described comprising a reciprocatory knife carrier, a knife carried thereby, the cutting edge of said knife being parallel to the lines of reciprocation to trim surplus material from the bottom of a lasted shoe with a drawing cut, and a guard arranged to control the closeness of trimming, said knife and guard being relatively adjustable transversely of said lines of reciprocation to compensate for grinding away the knife in sharpening it.

14. A machine of the character'described comprising a reciprocatory knife carrier, a knife carried thereby, the cutting edge of said knife being parallel to the lines of reciprocation to trim surplus material from the bottom of a lasted shoe with adrawing cut, and a guard arranged to control the closeness of trimming, said knife being adjustable relatively to its carrier transversely of said lines of reciprocation toregulate its cutting effect.

15. A shoe-trimming machine comprising two abutments arranged to guide a lasted shoe by engagingthe perimeter thereof in tandem relation, a cutter having a cutting edge arranged to sever surplus material on the shoe bottom flush with the latter, said cutting edge being between said abutments and transverse to a straight line passing through their points of engagement with the shoe, and means for operating said cutter.

16. A shoe-trimming machine comprising two guiding abutments arranged to run in tandem relation on the perimeter of an inverted lasted shoe, a cutter having acutting edge arranged to sever surplus material on the shoe bottom flush with the latter, said cutting edge being between said abutments and transverse to a straight line passing through their points of engagement with the shoe, said abutments being concave to overhang the margin of the shoe bottom, and means for operating said cutter with movement transverse to said line.

17. A machine of the character described comprising trimming mechanism including a cutter arranged to operate on the bottom of a lasted shoe to trim surplus material therefrom, means arranged to engage the shoe bottom adjacent to the trimming locality to control the closeness of trimming, and two spaced abutments arran ed in tandem relation to guide the shoe y engagement with its perimeter, said abutments havingconcave work-engaging portions arranged to overhang the shoe bottom to counteract rocking. V

18. A machine of the character described comprising a knife, mechanism including a rotary shaft for operating said knife by reciprocating it lengthwise of its cutting edge, a rotary abrading member for sharpening said cutting edge, a carrier arranged to move about the axis of said shaft tocarry said abrading member to and from said knife, and means for transmitting rotation from said shaft to said abrading member while the knife isbeing reciprocated by said operating mechanism.

19. A machine of the character described comprising a trimmingknife having a substantially straight cutting edge, a rotary grinder the axis of whichis substantially parallel. tosaid edge, means arranged to reciprocate said knife lengthwise of said edge, and powerdriven means arranged to rotate-said grinder at the same time to V sharpen said edge, said grinder being mov able to and from said knife.

20. A machine of the character described comprising a trimming knife having a substantially straight cutting edge, mechanism arranged to impart reciprocatory trimming motion to said knife lengthwise of said edge, and abrading member arranged to sharpen said edge, and power-driven'means arranged to operate said abrading member so that its knife-engaging surface will move transversely of said edge while the trimming motion of the knife continues as aforesaid.

In testimony whereof I have signed my name to this specification.

B-ERNHARDT JOR-GENSEN. 

